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Arnold H. Glasow It is harder to conceal ignorance than to acquire knowledge.
Leonardo da Vinci In order to arrive at knowledge of the motions of birds in the air, it is first necessary to acquire knowledge of the winds, which we will prove by the motions of water in itself, and this knowledge will be a step enabling us to arrive at the knowledge of beings that fly between the air and the wind.
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Arnold H. Glasow
Leonardo da Vinci